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Earnings Per Share - Anti-dilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based compensation awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total anti-dilutive securities (shares) 2,181,195 1,787,670 2,233,160 1,105,287